CN113049534A

CN113049534A - Method and computing device for determining light spot distribution in multiple gas reflecting chambers

Info

Publication number: CN113049534A
Application number: CN201911368068.4A
Authority: CN
Inventors: 孔榕; 周欣; 孙涛; 刘鹏
Original assignee: Beijing Normal University
Current assignee: Beijing Normal University
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2021-06-29
Anticipated expiration: 2039-12-26
Also published as: CN113049534B

Abstract

The invention discloses a method for determining the distribution of light spots in a multi-reflecting air chamber, which comprises the following steps: establishing an optical model of the multiple gas reflecting chambers so as to determine paths of the light rays in the multiple gas reflecting chambers according to the optical model, wherein path information comprises reflection times of the light rays and light spot distribution patterns formed by the light rays on a spherical mirror; setting relative distance ranges of the two spherical mirrors, and constructing a relative distance array based on a preset distance interval; setting light rays to be incident at a preset initial incident point coordinate and a preset initial incident angle respectively according to each relative distance value in the relative distance array, and determining the path of the light rays; and selecting a path with the reflection times within a preset reflection time range and the spot spacing within a preset spot spacing range as a candidate path, and generating a candidate path set and a corresponding candidate spot pattern set. In addition, the invention also discloses corresponding computing equipment. According to the method provided by the invention, the sensitivity and stability of the multi-gas-reflecting-chamber in practical spectrum detection application are improved.

Description

Method and computing device for determining light spot distribution in multiple gas reflecting chambers

Technical Field

The invention relates to the technical field of spectrum detection, in particular to a method and computing equipment for determining light spot distribution in a multi-reflector gas chamber.

Background

The optical multi-gas-reflecting chamber is widely applied to a Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology, and can realize a long optical path in a relatively small volume, so that the detection sensitivity is improved, and the detection limit is reduced. The optical multiple-reflector chamber needs to finely adjust a reflector in the gas chamber to ensure that a light beam enters the multiple-reflector chamber through an incident hole and is emitted from an exit hole after being reflected back and forth for a certain number of times. According to the Lambert-Beer law, the acting distance of light and a sample is increased, the amplitude of an absorption signal can be increased, the spectral detection sensitivity can be effectively improved, and multiple reflection is an effective way for realizing a long optical path. In the fields of scientific research, environmental protection, coal mine gas monitoring and the like, a spectrum absorption method is used for analyzing and detecting trace gases such as methane, carbon monoxide, oxygen and the like, a multi-gas-reflecting chamber with a long optical path is needed, and the longer the optical path is, the lower limit of the detectable concentration is.

The commonly used multiple gas-reflecting chambers at present are: white, Herriott, Chernin and discrete mirror chambers. The White-type multi-reflection gas chamber can realize multiple reflection of light beams in the multi-reflection gas chamber, but the design of the White-type multi-reflection gas chamber has some defects, such as overlarge volume, poor stability, low effective utilization rate of a mirror surface and the like, and the application range of the White-type multi-reflection gas chamber is limited. The Chernin type multi-gas-reflecting chamber is an improved optical multi-gas-reflecting chamber on the basis of the White type multi-gas-reflecting chamber, can change an absorption optical path at any time according to needs, but has a complex structure and a large volume, and limits the application of the Chernin type multi-gas-reflecting chamber in the requirement of a miniaturized instrument. The Herriott air chamber is formed by coaxially and symmetrically arranging two identical spherical reflectors, and a reflection light spot of light on each reflector presents a single circular or elliptical pattern, so that the utilization rate of the area of the cavity mirror is low. The discrete mirror multi-reflection chamber overcomes the defects of a Herriott type multi-reflection chamber, improves the utilization rate of the area of the cavity mirror, can form light spot distribution of Lissajous figures on the mirror surface, but has higher processing cost and low yield of discrete lenses.

In the Herriott air chamber and other traditional optical multi-reflection air chambers based on a common spherical reflector, under the condition that light spots are not overlapped, the reflection light spots of light rays on the reflector can only generate a circular or elliptical pattern, the defect that the utilization rate of the effective area of a mirror surface is low exists, and the generation of high reflection times in the multi-reflection air chamber with a miniaturized structure is difficult to realize.

Therefore, it is necessary to design a method for determining the distribution of light spots in the multi-reflector chamber, so as to improve the utilization rate of the reflecting mirror surface of the multi-reflector chamber in practical application, and to realize higher reflection times and optical path of light rays in the small multi-reflector chamber.

Disclosure of Invention

To this end, the present invention provides a method of determining the spot distribution within a multireflection cell that solves or at least mitigates the problems presented above.

According to one aspect of the invention, a method for determining a light spot distribution in a multi-gas reflecting chamber is provided, which is executed in a computing device, wherein the multi-gas reflecting chamber comprises a first spherical mirror and a second spherical mirror, light is suitable for being emitted into the multi-gas reflecting chamber from the first spherical mirror and being emitted after being reflected between the first spherical mirror and the second spherical mirror for multiple times, and the light is suitable for forming a light spot distribution pattern on the spherical mirrors; the method comprises the following steps: determining the curvature radius and the mirror surface diameter of the first spherical mirror and the second spherical mirror, and establishing an optical model of the multi-gas-reflecting chamber based on the curvature radius and the mirror surface diameter so as to determine the path of the light rays in the multi-gas-reflecting chamber according to the optical model, wherein the path information comprises the reflection times of the light rays between the first spherical mirror and the second spherical mirror and the light spot distribution pattern formed by the light rays on the first spherical mirror and the second spherical mirror; setting a relative distance range of the first spherical mirror and the second spherical mirror, and constructing a relative distance array based on a preset distance interval; setting light rays to be incident at a preset initial incidence point coordinate and a preset initial incidence angle respectively according to each relative distance value in the relative distance array, and determining paths of the light rays in the multiple gas reflecting chambers under the condition according to the optical model; selecting a path of which the reflection times are within a preset reflection time range and the light spot space is within a preset light spot space range in the light spot distribution pattern as a candidate path; and generating a candidate path set for all candidate paths in the relative distance range, acquiring the light spot distribution pattern corresponding to each candidate path in the candidate path set, and generating a candidate light spot pattern set.

Optionally, in the method for determining the distribution of light spots in the multiple gas reaction chambers according to the present invention, the step of setting the light rays to be incident at the predetermined initial incident point coordinates and the predetermined initial incident angle respectively includes: setting a first initial incident point coordinate and a first initial incident angle of light, and respectively constructing an initial incident point coordinate array and an initial incident angle array based on a predetermined coordinate difference value and a predetermined angle interval; and setting the light to be incident at each initial incidence point coordinate in the initial incidence point coordinate array and each initial incidence angle in the initial incidence angle array respectively.

Optionally, in the method for determining the light spot distribution in the multiple gas chambers according to the present invention, the path information includes coordinates of an exit point of the light; the step of selecting a candidate path comprises: and selecting a path with the reflection times within a preset reflection time range, the spot spacing within a preset spot spacing range in the spot pattern and the coordinates of the emergent point being the same as the coordinates of the preset initial incident point as the candidate path.

Optionally, in the method for determining the distribution of light spots in the multiple gas reflecting chambers according to the present invention, the optical model is a spherical equation established based on the spherical surfaces on which the first spherical mirror and the second spherical mirror are located, and the step of determining the light path includes: calculating the coordinates of the current intersection point of the current incident light and the second spherical mirror based on the incident point coordinates and the incident angle of the current incident light incident from the first spherical mirror and the spherical equation, and determining the reflection angle of the current reflected light reflected by the second spherical mirror; taking the current reflection light as the next incident light incident from the second spherical mirror, and respectively taking the current intersection point coordinate and the reflection angle of the current reflection light as the incident point coordinate and the incident angle of the next incident light incident from the second spherical mirror; calculating the next intersection point coordinate of the next incident ray and the first spherical mirror based on the incident point coordinate and the incident angle of the next incident ray and the spherical equation, and determining the reflection angle of the next reflected ray reflected by the first spherical mirror; and after the light rays are determined to be emitted through the spherical mirror, determining the light spot distribution pattern formed by the light rays on the first spherical mirror and the second spherical mirror based on the determined coordinates of the plurality of intersection points.

Optionally, in the method for determining the distribution of the light spots in the multiple gas reflecting chambers, the relative distance d ranges from d ≦ 2R, wherein R is the curvature radius of the first spherical mirror and the second spherical mirror.

Optionally, in the method of determining a spot distribution in a multiradiation plenum according to the present invention, the predetermined distance interval is 1 mm.

Optionally, in the method for determining the distribution of the light spots in the multi-reflector air chamber, the predetermined number of reflections ranges from 6 to 1000.

Alternatively, in the method of determining the spot distribution in the multiple gas cell according to the present invention, the predetermined spot pitch range is not less than 1 mm.

Optionally, in the method for determining the distribution of the light spots in the multiple gas reflecting chambers according to the present invention, the first spherical mirror and the second spherical mirror are coaxially and symmetrically arranged, and the radius of curvature and the mirror surface diameter of the first spherical mirror and the second spherical mirror are the same.

Optionally, in the method for determining the distribution of the light spots in the multiple gas reaction chambers according to the present invention, the method further includes the steps of: determining a stable interval of the shooting point coordinates; determining an exit point coordinate corresponding to each candidate path in the candidate path set and a corresponding relative distance; setting a first stability index corresponding to the relative distance; determining a real-time relative distance based on the relative distance and a first stability index, determining a first real-time path of the light in the multiple gas reflecting chambers based on the real-time relative distance, and determining a first real-time emergent point coordinate of the light according to the first real-time path; judging whether the first real-time exit point coordinate is in the stable interval, if so, taking the corresponding candidate path as a first stable path, and generating a first stable path set for all first stable paths in the candidate path set; and acquiring a light spot distribution pattern corresponding to each first stable path in the first stable path set to generate a first stable light spot pattern set.

Optionally, in the method for determining the distribution of the light spots in the multiple gas reaction chambers according to the present invention, the method further includes the steps of: determining a stable interval of the shooting point coordinates; determining an exit point coordinate corresponding to each candidate path in the candidate path set and a corresponding initial incident angle; setting a second stable index corresponding to the initial incident angle; determining a real-time initial incident angle based on the initial incident angle and a second stable index, determining a second real-time path of the light in the multiple gas reflecting chambers based on the real-time initial incident angle, and determining a second real-time emergent point coordinate of the light according to the second real-time path; judging whether the second real-time exit point coordinate is in the stable interval, if so, taking the corresponding candidate path as a second stable path, and generating a second stable path set for all second stable paths in the candidate path set; and acquiring a light spot distribution pattern corresponding to each second stable path in the second stable path set to generate a second stable light spot pattern set.

Optionally, in the method for determining the distribution of the light spots in the multiple gas reaction chambers according to the present invention, the method further includes the steps of: acquiring all stable paths included by the first stable path set and the second stable path set to generate a target stable path set; and acquiring a light spot distribution pattern corresponding to each stable path in the target stable path set to generate a target stable light spot pattern set.

According to an aspect of the present invention, there is provided a computing device comprising: at least one processor; and a memory storing program instructions, wherein the program instructions are configured to be executed by the at least one processor, the program instructions comprising instructions for performing the method as described above.

According to an aspect of the present invention, there is provided a readable storage medium storing program instructions which, when read and executed by a computing device, cause the computing device to perform the method as described above.

According to the technical scheme, the invention provides a method for determining the light spot distribution in the multi-gas-reflecting chamber, which is characterized in that a corresponding optical model of the multi-gas-reflecting chamber is established based on the structure and the principle of the multi-gas-reflecting chamber, and the path of light rays is traced based on the optical model so as to determine the light spot distribution condition of the light rays on the spherical mirror. Specifically, for each set relative distance value, light is set to be incident at a preset initial incidence point coordinate and a preset initial incidence angle, and the path of the light and the corresponding light spot distribution pattern are determined. In addition, the invention sets the range of the preset reflection times and the range of the preset facula space based on the stability of the light path transmission, and selects all candidate paths meeting the conditions based on the range of the preset reflection times and the range of the preset facula space to generate a candidate path set. And obtaining a candidate light spot pattern set by obtaining the candidate light spot pattern corresponding to each candidate path. In practical application, the most appropriate light spot distribution pattern is selected according to the candidate light spot pattern set determined by the technical scheme of the invention, and the relevant parameters of the multi-gas reflecting chamber are set based on the determined light spot distribution pattern, so that the stability of light path transmission can be ensured. Under the condition of ensuring the stability of light path transmission, the sensitivity of the multi-gas reflecting chamber in actual spectrum detection application and the range of detectable concentration are improved by selecting the path with higher corresponding reflection times and longer total optical path in the candidate paths.

Furthermore, stability of the light emergent point is considered on the basis of determining the candidate path, and a target stable path set and a target stable light spot pattern set are determined by setting a stability index and a stability interval. Based on the target stable path set and the target stable light spot pattern set, the method is beneficial to selecting paths with higher stability and light spot distribution patterns in practical application, and setting corresponding parameters in the multi-gas-reflecting-chamber to ensure the stability of the multi-gas-reflecting-chamber in practical spectrum detection application.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

To the accomplishment of the foregoing and related ends, certain illustrative aspects are described herein in connection with the following description and the annexed drawings, which are indicative of various ways in which the principles disclosed herein may be practiced, and all aspects and equivalents thereof are intended to be within the scope of the claimed subject matter. The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description read in conjunction with the accompanying drawings. Throughout this disclosure, like reference numerals generally refer to like parts or elements.

FIG. 1 shows a schematic diagram of a computing device 100, according to one embodiment of the invention;

FIG. 2 illustrates a schematic structural view of a multiple gas reaction chamber 200 according to one embodiment of the present invention;

FIG. 3 shows a schematic flow diagram of a method 300 of determining a spot distribution within a multiple gas dome, according to one embodiment of the invention;

FIG. 4 illustrates a schematic view of incident angles of incident light according to one embodiment of the present invention;

fig. 5 to 7 are schematic diagrams respectively showing light spot distribution patterns formed by the method for determining the light spot distribution in the multiple gas reaction chamber according to one embodiment of the invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the technical solution according to the present invention, the method 300 for determining the light spot distribution in the multiple gas reflection chamber is implemented by a computing device by establishing an optical model of the multiple gas reflection chamber in the computing device. The candidate paths of the light rays meeting the preset conditions and the corresponding light spot distribution patterns are determined, and the relevant parameters of the multi-gas-reflecting chamber in the spectrum detection application are designed based on the candidate light spot distribution patterns. One example of a computing device is first shown below.

Fig. 1 is a schematic block diagram of an example computing device 100.

As shown in FIG. 1, in a basic configuration 102, a computing device 100 typically includes a system memory 106 and one or more processors 104. A memory bus 108 may be used for communication between the processor 104 and the system memory 106.

Depending on the desired configuration, the processor 104 may be any type of processing, including but not limited to: a microprocessor (μ P), a microcontroller (μ C), a Digital Signal Processor (DSP), or any combination thereof. The processor 104 may include one or more levels of cache, such as a level one cache 110 and a level two cache 112, a processor core 114, and registers 116. The example processor core 114 may include an Arithmetic Logic Unit (ALU), a Floating Point Unit (FPU), a digital signal processing core (DSP core), or any combination thereof. The example memory controller 118 may be used with the processor 104, or in some implementations the memory controller 118 may be an internal part of the processor 104.

Depending on the desired configuration, system memory 106 may be any type of memory, including but not limited to: volatile memory (such as RAM), non-volatile memory (such as ROM, flash memory, etc.), or any combination thereof. System memory 106 may include an operating system 120, one or more applications 122, and program data 124. In some implementations, the application 122 can be arranged to execute instructions on an operating system with program data 124 by one or more processors 104.

Computing device 100 may also include an interface bus 140 that facilitates communication from various interface devices (e.g., output devices 142, peripheral interfaces 144, and communication devices 146) to the basic configuration 102 via the bus/interface controller 130. The example output device 142 includes a graphics processing unit 148 and an audio processing unit 150. They may be configured to facilitate communication with various external devices, such as a display or speakers, via one or more a/V ports 152. Example peripheral interfaces 144 may include a serial interface controller 154 and a parallel interface controller 156, which may be configured to facilitate communication with external devices such as input devices (e.g., keyboard, mouse, pen, voice input device, touch input device) or other peripherals (e.g., printer, scanner, etc.) via one or more I/O ports 158. An example communication device 146 may include a network controller 160, which may be arranged to facilitate communications with one or more other computing devices 162 over a network communication link via one or more communication ports 164.

A network communication link may be one example of a communication medium. Communication media may typically be embodied by computer readable instructions, data structures, program modules, and may include any information delivery media, such as carrier waves or other transport mechanisms, in a modulated data signal. A "modulated data signal" may be a signal that has one or more of its data set or its changes made in such a manner as to encode information in the signal. By way of non-limiting example, communication media may include wired media such as a wired network or private-wired network, and various wireless media such as acoustic, Radio Frequency (RF), microwave, Infrared (IR), or other wireless media. The term computer readable media as used herein may include both storage media and communication media.

Computing device 100 may be implemented as a personal computer including both desktop and notebook computer configurations. Of course, computing device 100 may also be implemented as part of a small-form factor portable (or mobile) electronic device such as a cellular telephone, a digital camera, a Personal Digital Assistant (PDA), a personal media player device, a wireless web-watch device, a personal headset, an application specific device, or a hybrid device that include any of the above functions. And may even be implemented as a server, such as a file server, a database server, an application server, a WEB server, and so forth. The embodiments of the present invention are not limited thereto.

In an embodiment according to the invention, the computing device 100 is configured to perform a method 300 of determining a spot distribution within a multiradiation plenum according to the invention. Among other things, application 122 of computing device 100 contains a plurality of program instructions that implement method 300 for determining a spot distribution within a multiple gas chamber in accordance with the present invention.

It should be noted that the method 300 for determining the distribution of light spots in the multiple gas reaction chamber according to the embodiment of the present invention is to establish an optical model of the multiple gas reaction chamber and track the path of the light based on the optical model to determine the distribution of light spots in the multiple gas reaction chamber.

Fig. 2 shows a schematic structural diagram of a multi-reaction chamber 200 according to an embodiment of the present invention.

As shown in fig. 2, the multi-gas reflecting chamber 200 includes two spherical mirrors, a first spherical mirror 210 and a second spherical mirror 220, which are coaxially and symmetrically arranged. A reflective chamber 250 is formed between the first spherical mirror 210 and the second spherical mirror 220. The first spherical mirror 210 is provided with an incident hole 211, light is suitable for being incident into the reflection chamber 250 of the multi-reflector from the incident hole 211, and the light is reflected between the first spherical mirror 210 and the second spherical mirror 220 for multiple times, and each reflection generates a reflection light spot on the first spherical mirror 210 and the second spherical mirror 220. After multiple reflections, the light exits the reflective chamber 250 through the first spherical mirror 210 or the second spherical mirror 220.

It should be noted that, according to the structure and principle of the multi-reflector 200 in the embodiment of the present invention, after the light is reflected for multiple times in the reflection chamber 250 of the multi-reflector, the multiple reflection light spots generated on the spherical mirrors are regularly distributed, and the specific shape of the light spot distribution pattern is related to the relative distance between the two spherical mirrors, the coordinates of the incident point of the light, and the incident angle of the light.

Based on the structure and principle of the multiple gas reflection chamber 200, the invention provides a method 300 for determining the light spot distribution in the multiple gas reflection chamber. In the method 300, based on the structure and principle of the multi-gas-reaction chamber 200, after determining the curvature radius and the mirror surface diameter of the first spherical mirror 210 and the second spherical mirror 220 in the multi-gas-reaction chamber 200, an optical model corresponding to the multi-gas-reaction chamber 200 is built through a Matlab language writing program, so that a computing device executes the method 300 for light spot distribution in the multi-gas-reaction chamber according to the invention through a plurality of program instructions. The present invention is not limited to the Matlab software for programming, and all the programming software capable of establishing the optical model of the multiple gas reflectors in the prior art are within the protection scope of the present invention.

Fig. 3 shows a flow diagram of a method 300 of determining a spot distribution in a multiple gas cell, according to an embodiment of the invention. As shown in fig. 3, the method 300 begins at step S310.

In step S310, the curvature radii and the mirror surface diameters of the first and second spherical mirrors of the multi-gas-reflecting chamber 200 are determined. And an optical model of the multiple gas reflecting chambers is established based on the curvature radius and the mirror surface diameter of the two spherical mirrors. Here, the optical model is established based on the structure and principle of the multi-reflector 200, so that the optical model can trace the path of the light ray in the multi-reflector 200 based on the structure of the multi-reflector, that is, the path from the first spherical mirror 210 to the second spherical mirror 220 to the light ray after the trace light ray is incident into the multi-reflector 200 through the first spherical mirror 210. The path information comprises the reflection times of the light rays between the first spherical mirror and the second spherical mirror and the light spot distribution patterns formed by the light rays on the first spherical mirror and the second spherical mirror. In addition, the path information also includes the initial incident point coordinates and the reflection point coordinates of the ray.

Subsequently, in step S320, a relative distance range of the first spherical mirror 210 and the second spherical mirror 220 is set, and a relative distance array is constructed based on a predetermined distance interval.

Here, after the relative distance array is constructed based on the relative distance range, the predetermined distance interval, each relative distance value may be sequentially acquired from the relative distance array. Thus, the path of the light in the multi-reflection air chamber can be traced and determined according to different relative distance values between the two spherical mirrors.

In a kind of fruitIn the embodiment, based on the structure and principle of the multiple gas reflection chambers 200 and considering the stability and practicability of the optical path transmission comprehensively, the present invention sets the value range of the relative distance d between the first spherical mirror 210 and the second spherical mirror 220 to be d less than or equal to 2R (R is the curvature radius of the first spherical mirror and the second spherical mirror). On the basis, a relative distance array of the first spherical mirror and the second spherical mirror is established according to the preset distance interval. The predetermined distance interval is, for example, 1mm, and here, the present invention is not limited to the value of the predetermined distance interval, and the specific value of the predetermined distance interval may be set by a person skilled in the art according to the actual situation. In this way, in the present embodiment, the relative distance array { d } can be constructed based on the minimum value (1mm), the maximum value (2Rmm) and the predetermined distance interval (1mm) of the relative distance d_n}。d_nIs a distance array { d_nRelative distance value in (b), wherein d_nThe values of (A) are as follows: 1mm, 2mm, 3mm … … (2R-1) mm, 2 Rmm.

It should be noted that, based on the principle of the multiple gas reflection cell 200, when the relative distance of the two spherical mirrors is a certain value, the more times the light is reflected in the reflection chamber, the longer the total optical length. However, in practical applications, stability of optical path transmission needs to be considered. When the reflection times are too many, the reflected light rays are too dense, so that interference phenomena are easy to generate among the reflected light rays, energy loss is caused, and a periodic interference signal is generated; when the number of times of reflection is too small, the reflected light is too sparse, and although no interference phenomenon occurs between the reflected light, the total optical path is too short, so that the spectrum detection sensitivity and the detectable concentration range in practical application are affected.

In one embodiment, the predetermined number of reflections of the light in the reflection chamber 250 is determined to be in the range of 6 to 1000 times based on the structure and principle of the multi-reflection chamber 200, considering the stability and practicability of the light path transmission. In addition, in order to avoid the light spots from overlapping on the spherical mirror to form interference fringes, the minimum distance between two adjacent light spots on the spherical mirror is set to be 1mm, namely, the predetermined light spot distance range determined by the invention is not less than 1 mm.

Subsequently, in step S330, the relative distance is targetedIon set { d_nEach relative distance value d_nThe light rays are set to be incident from the first spherical mirror 210 at a predetermined initial incidence point coordinate and a predetermined initial incidence angle respectively, and the paths of the light rays in the multi-gas-reflecting chamber 200 under the condition are determined according to the optical model.

It should be noted that, based on a similar principle, the present invention comprehensively considers stability and practicability of optical path transmission to construct an initial incident point coordinate array and an initial incident angle array of light, so as to sequentially obtain each initial incident point coordinate from the initial incident point coordinate array as a predetermined initial incident point coordinate, and sequentially obtain each initial incident angle from the initial incident angle array as a predetermined initial incident angle. It should be understood that when the relative distance of the two spherical mirrors is set to each relative distance value in the relative distance array, the light is set to be incident at each predetermined initial incident point coordinate and each predetermined initial incident angle obtained by the above method, respectively. In this way, for each relative distance value set by the two spherical mirrors, all initial incidence point coordinates in the initial incidence point coordinate array and all initial incidence angles in the initial incidence angle array are set for the light, and the path of the light in the multi-reflector based on the set conditions is traced.

Specifically, the method for constructing the initial incidence point coordinate array of the ray is executed according to the following steps: first initial incident angle and preset angle interval of light rays are set. Further, an initial incident angle array is constructed based on the first initial incident angle and the predetermined angle interval. Accordingly, the method for constructing the initial incidence angle array of the light rays is executed according to the following steps: first initial incidence point coordinates and a preset coordinate difference value of the light rays are determined. And then, constructing an initial incidence point coordinate array based on the first initial incidence point coordinate of the ray and a preset coordinate difference value. In this way, for each relative distance value, the ray is set to be incident at each initial incidence point coordinate in the initial incidence point coordinate array and each initial incidence angle in the initial incidence angle array respectively.

According to one embodiment, the optical model is a spherical equation established based on the sphere on which the first and second spherical mirrors are located. The method for determining the path of the light in the multiple gas reflecting chambers is further executed according to the following steps:

calculating the coordinates of the current intersection point of the current incident light and the second spherical mirror based on the incident point coordinates and the incident angle of the current incident light incident from the first spherical mirror and the spherical equation, and determining the reflection angle of the current reflected light reflected by the second spherical mirror;

taking the current reflection light as the next incident light incident from the second spherical mirror, and respectively taking the current intersection point coordinate and the reflection angle of the current reflection light as the incident point coordinate and the incident angle of the next incident light incident from the second spherical mirror;

calculating the next intersection point coordinate of the next incident ray and the first spherical mirror based on the incident point coordinate and the incident angle of the next incident ray and a spherical equation, and determining the reflection angle of the next reflected ray reflected by the first spherical mirror;

by repeating the above steps until it is determined that the light ray is emitted from the multiple gas reflecting chambers through the spherical mirror (the first spherical mirror or the second spherical mirror), the complete path of the light ray in the multiple gas reflecting chambers can be determined.

It should be noted that after determining that the light rays are emitted through the spherical mirrors, the final light spot distribution patterns formed on the first spherical mirror and the second spherical mirror by the light rays are determined based on the determined coordinates of the plurality of intersection points.

According to one embodiment of the present invention, the first and second

spherical mirrors

210, 220 have the same radius of curvature and mirror surface diameter. Here, the present invention is not limited to specific numerical values of the radius of curvature and the mirror surface diameter of the first and second

spherical mirrors

210, 220. It should be noted that, in other embodiments, the first spherical mirror 210 and the second spherical mirror 220 may have different radii of curvature and mirror surface diameters, and the light spot distribution pattern may also be determined according to the method for calculating the light spot distribution pattern formed on the spherical mirror by the light ray in one embodiment of the present invention. Here, other embodiments will not be described in detail.

According to one embodiment, the first and second

spherical mirrors

210, 220 of the multi-gas reflecting chamber 200 have the same radius of curvature and mirror surface diameter, and the two spherical mirrors are arranged coaxially and symmetrically.

As shown in fig. 2, the positional relationship between the two spherical mirrors of the multi-gas-reaction chamber 200 is represented by spatial coordinates, and the first spherical mirror 210 is provided with an entrance hole 211 at a position where x is 0. Referring to FIG. 4, incident light rays are incident from the aperture at angles θ (angle to the y-axis in the y-z plane) and φ (angle to the x-axis in the x-z plane). The curvature radius of the two spherical mirrors is R, and the radius of the mirror surface is R_mirThe relative distance is d. The centers of the first and second

spherical mirrors

210 and 220 are located at z-d/2 and z-d/2, respectively. The light is incident into the multi-reflection gas chamber 200 through the incident hole 211, and after N times of reflection under the preset condition, the radius of the light is R_holeAnd exits through exit aperture 222. Center coordinate of exit hole 222 is P_hole＝[X_hole,Y_hole,Z_hole]。

The exit hole 222 may be provided in the first spherical mirror 210 or the second spherical mirror 220, and the light is incident into the multiple gas reflecting chambers through the incident hole 211, reflected between the first spherical mirror 210 and the second spherical mirror 220N times, and then emitted from the exit hole 222.

The exit aperture 222 is provided on the first spherical mirror 210 and coincides with the entrance aperture 211 when the reentrant condition is satisfied. That is, the light enters the multiple reflection air chambers through the entrance hole 211, is reflected between the first spherical mirror 210 and the second spherical mirror 220N times, and then exits through the entrance hole 211.

And then, calculating the light spot distribution of the light on the spherical mirror by an algebraic method of intersection of the light and the sphere.

Specifically, let incident light be

Where the superscript i represents the ith reflection,

and

the coordinate of the incident point and the incident direction vector of the ith reflection are respectively.

Here, the angles of incidence θ and φ are written as directional vectors r⁽ⁱ⁾A form of (1), wherein r⁽ⁱ⁾Is a unit vector.

Establishing an equation of a ball where the spherical mirror is positioned, and setting the coordinates of the center of the ball as

The coordinates of each point on the spherical surface are

The constraint equation of the ball is established as

It should be noted that the odd and even reflections are different for spherical mirrors, and therefore the corresponding spherical center coordinates are also changed as follows:

the constraint equation of the incident ray substituted into the ball is arranged to obtain:

wherein,

equation (2) is a quadratic equation of one-dimensional form, the solution of which is:

when discriminant B²And when-4C < 0, the light ray does not intersect the spherical mirror. In a multi-reflector cell, the larger positive root is away from the point where the light source intersects the spherical mirror. After the time t is obtained, the intersection point of the actual incident light and the spherical mirror, the normal vector of the intersection point and the reflection direction vector of the light are respectively as follows:

here, each of the coordinates of the reflection point and the reflection direction vector of the reflected light ray can be regarded as the coordinates of the incident point of the next reflection and the direction vector of the incident light ray, and therefore, a recursive form can be written:

the light rays are reflected back and forth in the multiple gas reflecting chambers, and when the light rays reach the spherical mirror provided with the exit hole after being reflected for the (N-1) th time, if the coordinates of the light rays on the spherical mirror meet the conditions:

the light will be transmitted out of the exit aperture.

If the light can be stably reflected in the multiple gas reflecting chambers, the following conditions are required:

subsequently, in step S340, a path in which the number of reflections is within a predetermined number of reflections and the spot pitch is within a predetermined spot pitch range in the spot distribution pattern is selected as a candidate path in the ray path. Here, the path of the light ray includes a path of the light ray determined based on each of the set predetermined distance value, the predetermined initial incident point coordinates, and the predetermined initial incident angle parameter. The light spot distribution pattern is a set of all light spots formed by reflecting light rays on the first spherical mirror and the second spherical mirror, and the light spot space comprises the space between any two adjacent light spots in the light spot distribution pattern. As mentioned above, the predetermined number of reflections is in the range of 6 to 1000, and the predetermined spot pitch is not less than 1 mm.

Finally, in step S350, a candidate path set is generated for all candidate paths within the relative distance range, and a spot distribution pattern corresponding to each candidate path in the candidate path set is obtained, so as to generate a candidate spot pattern set.

It should be noted that, based on the determined path of the light ray under each set relative distance value, the predetermined initial incidence point coordinate and the predetermined initial incidence angle parameter, one spot distribution pattern is respectively corresponded. And determining paths meeting the conditions as candidate paths according to the set preset range of the reflection times and the preset range of the facula intervals, wherein each candidate path also corresponds to one candidate facula pattern. The candidate spot pattern set is the set of spot distribution patterns determined according to the technical solution of the present invention. In practical application, the most appropriate light spot distribution pattern is selected according to the candidate light spot pattern set determined by the technical scheme of the invention, and the relevant parameters of the multi-gas reflecting chamber are set based on the determined light spot distribution pattern, so that the stability of light path transmission can be ensured. Under the condition of ensuring the stability of light path transmission, the sensitivity of the multi-gas reflecting chamber in actual spectrum detection application and the range of detectable concentration are improved by selecting the path with higher corresponding reflection times and longer total optical path in the candidate paths.

According to one embodiment, the method of selecting a candidate path further comprises the steps of: and selecting a path with the reflection times within a preset reflection time range, the spot spacing within a preset spot spacing range in the spot pattern and the coordinates of the emergent point as the coordinates of the preset initial incident point as a candidate path. Here, when selecting the candidate path, it is further defined that the coordinates of the exit point in the path are the same as the coordinates of the predetermined initial incident point, so that it can be ensured that the selected candidate path satisfies the reentrant condition, that is, the exit point coincides with the incident point. In practical application, after the candidate paths are selected based on the candidate path set meeting the reentrant condition, the initial incident point coordinates of the light and the corresponding incident holes are set based on the determined candidate paths, so that the light can be emitted from the incident holes into the multiple reflection gas chambers, and can be reflected for multiple times in the multiple reflection gas chambers and then emitted from the incident holes.

In an embodiment according to the present invention, the path information further includes an optical path corresponding to the path. By establishing the corresponding relation among the optical path, the light spot distribution pattern, the relative distance, the initial incidence angle and the initial incidence point coordinate for each candidate path, a corresponding relation list is generated, so that the relation among the light spot distribution pattern, the optical path, the relative distance, the initial incidence angle and the initial incidence point coordinate can be analyzed according to the corresponding relation list, the most appropriate light spot distribution pattern can be selected in practical application, and the relevant parameters of the multi-gas-reflecting chamber can be set according to the light spot distribution pattern.

In one embodiment, the first and second spherical mirrors each have a radius of curvature R of 100mm and a mirror surface diameter D of 50.8 mm.

When the relative distance d between the two spherical mirrors is 106mm, the light rays are traced by determining other parameters, and the light spot distribution result determined based on the method is the light spot distribution pattern of the petal shape shown in fig. 5. In addition, the volume of the multi-gas reflecting chamber is 330.0cm³The light undergoes 138 reflections between the two spherical mirrors and an effective optical path length of 14.6 meters can be achieved.

When the relative distance of the two spherical mirrors is 107mm, the light is traced by determining other parameters. The spot distribution pattern determined based on the above algorithm is shown in fig. 6. In addition, the volume of the multi-reaction chamber is 332.1cm³The light is reflected 183 times between the two spherical mirrors and an effective optical path of 19.7m length can be achieved.

It can be seen that the spot distribution patterns shown in fig. 5 and 6 are each petal-shaped, and the difference between the two patterns is that the spot distribution pattern includes a different number of petals, the pattern shown in fig. 5 includes 6 petals, and the pattern shown in fig. 6 includes 10 petals.

When the relative distance d between the two spherical mirrors is 123mm, the light is traced by determining other parameters, and the result of the spot distribution determined based on the above algorithm is 7 circular spot distribution patterns shown in fig. 7. In addition, the volume of the multi-gas reflecting chamber is 364.5cm³The light undergoes 231 reflections between the two spherical mirrors and an effective optical path length of 28.4 meters can be achieved.

Based on the above embodiments, different light spot distribution patterns can be formed on the spherical mirrors by adjusting the relative distance between the two spherical mirrors, the incident point position of the light and the incident angle of the light. The parameters corresponding to each light spot distribution pattern are detailed in table 1, and it can be known from table 1 that the multiple reflection chambers corresponding to 7 circular light spot distribution patterns can realize the relatively highest reflection times and optical paths, and the effective optical path can reach 28.4 meters.

TABLE 1

In addition, in practical applications, the multi-gas reflecting chamber 200 is affected by factors such as the temperature of the environment, and the relative distance between the two spherical mirrors and the actual value of the incident angle of the light beam may deviate from the theoretical value. Therefore, in embodiments according to the present invention, the stability of the light exit point is also considered and analyzed. And detecting the stability of all candidate paths in the candidate path set based on the stability index by setting the stability index so as to determine a stable path and a corresponding stable light spot distribution pattern. The stability index comprises a first stability index related to the relative distance between the first spherical mirror and the second spherical mirror and a second stability index related to the initial incident angle of the light. It should be noted that the first stability index and the second stability index are understood as deviation values set for the relative distance between the two spherical mirrors and the initial incident angle of the light ray according to the present invention.

In addition, a stable interval of the coordinates of the exit point is determined according to the judgment basis of the stability of the exit point, wherein the specific setting of the stable interval is related to the position and the size of the exit hole in practical application, so that whether the light can be emitted from the original exit hole or not is judged according to the technical scheme of the invention under the condition that the preset distance and the initial incident angle are deviated in the practical application. That is, when the relative distance and the initial incident angle (theoretical value) corresponding to the candidate path are changed based on the stability index set by the present invention, if the actual coordinates of the emergent point corresponding to the actual path of the light obtained after the change are within the stable interval, it is indicated that the candidate path meets the stability criterion, and the candidate path can be used as a stable path, and the light spot distribution pattern corresponding to the stable path is used as a stable light spot distribution pattern. Otherwise, the candidate path is not in accordance with the stability standard.

According to one embodiment, the method of determining a stable path and a stable cursor distribution pattern is performed according to the following steps:

and determining a stable interval of the coordinates of the emergent points, and determining the coordinates of the emergent points corresponding to each candidate path in the candidate path set, the corresponding relative distance and the initial incident angle.

A first stability index corresponding to the relative distance and a second stability index corresponding to the initial incident angle are set.

And determining a real-time relative distance based on the relative distance and the first stable index, determining a first real-time path of the light in the multiple gas reflecting chambers based on the real-time relative distance, and determining a first real-time emergent point coordinate of the light according to the first real-time path. And judging whether the first real-time exit point coordinate is in a stable interval, if so, taking the corresponding candidate path as a first stable path, and generating a first stable path set for all first stable paths in the candidate path set. And acquiring a light spot distribution pattern corresponding to each first stable path in the first stable path set to generate a first stable light spot pattern set.

And determining a real-time initial incident angle based on the initial incident angle and a second stable index, determining a second real-time path of the light in the multiple gas reflecting chambers based on the real-time initial incident angle, and determining a second real-time emergent point coordinate of the light according to the second real-time path. And judging whether the second real-time exit point coordinate is in the stable interval, if so, taking the corresponding candidate path as a second stable path, and generating a second stable path set for all second stable paths in the candidate path set. And acquiring the light spot distribution pattern corresponding to each second stable path in the second stable path set to generate a second stable light spot pattern set.

It will be appreciated that the first set of stabilization paths, the first set of stabilization spot patterns, are the result of satisfying a first stabilization indicator corresponding to relative distance. The second stable path set and the second stable spot pattern set are the results obtained by satisfying the second stable index corresponding to the initial incident angle.

Further, a final target stable path set is generated by acquiring all stable paths included in the first stable path set and the second stable path set. Correspondingly, a target stable light spot pattern set is generated by acquiring the light spot distribution pattern corresponding to each stable path in the target stable path set. The target stable path set and the target stable light spot pattern set are results obtained under the condition that the first stable index and the second stable index are both met.

Based on the determined target stable path set and the target stable light spot pattern set, the method is beneficial to selecting paths and light spot distribution patterns with higher stability in practical application, and setting parameters such as relative distance of the corresponding spherical mirror, initial light incident point coordinates and initial incident angles, and the like, so that the stability of the multi-gas-reflecting-chamber in practical spectrum detection application is ensured.

The various techniques described herein may be implemented in connection with hardware or software or, alternatively, with a combination of both. Thus, the methods and apparatus of the present invention, or certain aspects or portions thereof, may take the form of program code (i.e., instructions) embodied in tangible media, such as removable hard drives, U.S. disks, floppy disks, CD-ROMs, or any other machine-readable storage medium, wherein, when the program is loaded into and executed by a machine, such as a computer, the machine becomes an apparatus for practicing the invention.

In the case of program code execution on programmable computers, the computing device will generally include a processor, a storage medium readable by the processor (including volatile and non-volatile memory and/or storage elements), at least one input device, and at least one output device. Wherein the memory is configured to store program code; the processor is configured to execute the data storage method and/or the data query method of the present invention according to instructions in the program code stored in the memory.

By way of example, and not limitation, readable media may comprise readable storage media and communication media. Readable storage media store information such as computer readable instructions, data structures, program modules or other data. Communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media. Combinations of any of the above are also included within the scope of readable media.

In the description provided herein, algorithms and displays are not inherently related to any particular computer, virtual system, or other apparatus. Various general purpose systems may also be used with examples of this invention. The required structure for constructing such a system will be apparent from the description above. Moreover, the present invention is not directed to any particular programming language. It is appreciated that a variety of programming languages may be used to implement the teachings of the present invention as described herein, and any descriptions of specific languages are provided above to disclose the best mode of the invention.

In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in a device as described in this embodiment or alternatively may be located in one or more devices different from the devices in this example. The modules in the foregoing examples may be combined into one module or may be further divided into multiple sub-modules.

Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.

Furthermore, some of the described embodiments are described herein as a method or combination of method elements that can be performed by a processor of a computer system or by other means of performing the described functions. A processor having the necessary instructions for carrying out the method or method elements thus forms a means for carrying out the method or method elements. Further, the elements of the apparatus embodiments described herein are examples of the following apparatus: the apparatus is used to implement the functions performed by the elements for the purpose of carrying out the invention.

As used herein, unless otherwise specified the use of the ordinal adjectives "first", "second", "third", etc., to describe a common object, merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.

While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense with respect to the scope of the invention, as defined in the appended claims.

Claims

1. A method of determining a spot distribution within a multiple gas reflection chamber, performed in a computing device, the multiple gas reflection chamber comprising a first spherical mirror and a second spherical mirror, light adapted to be injected into the multiple gas reflection chamber from the first spherical mirror and to be injected after multiple reflections between the first spherical mirror and the second spherical mirror, and light adapted to form a spot distribution pattern on the spherical mirrors; the method comprises the following steps:

determining the curvature radius and the mirror surface diameter of the first spherical mirror and the second spherical mirror, and establishing an optical model of the multi-gas-reflecting chamber based on the curvature radius and the mirror surface diameter so as to determine the path of the light rays in the multi-gas-reflecting chamber according to the optical model, wherein the path information comprises the reflection times of the light rays between the first spherical mirror and the second spherical mirror and the light spot distribution pattern formed by the light rays on the first spherical mirror and the second spherical mirror;

setting a relative distance range of the first spherical mirror and the second spherical mirror, and constructing a relative distance array based on a preset distance interval;

setting light rays to be incident at a preset initial incidence point coordinate and a preset initial incidence angle respectively according to each relative distance value in the relative distance array, and determining paths of the light rays in the multiple gas reflecting chambers under the condition according to the optical model;

selecting a path of which the reflection times are within a preset reflection time range and the light spot space is within a preset light spot space range in the light spot distribution pattern as a candidate path; and

and generating a candidate path set for all candidate paths in the relative distance range, acquiring a light spot distribution pattern corresponding to each candidate path in the candidate path set, and generating a candidate light spot pattern set.

2. The method of determining a distribution of light spots within a multireflection cell as recited in claim 1, wherein the step of setting the light rays to be incident at predetermined initial incident point coordinates and predetermined initial incident angles, respectively, comprises:

setting a first initial incident point coordinate and a first initial incident angle of light, and respectively constructing an initial incident point coordinate array and an initial incident angle array based on a predetermined coordinate difference value and a predetermined angle interval;

and setting the light to be incident at each initial incidence point coordinate in the initial incidence point coordinate array and each initial incidence angle in the initial incidence angle array respectively.

3. The method of determining the spot distribution within a multireflection gas cell of claim 1 or 2, wherein the path information comprises the coordinates of the point of departure of the light; the step of selecting a candidate path comprises:

and selecting a path with the reflection times within a preset reflection time range, the spot spacing within a preset spot spacing range in the spot pattern and the coordinates of the emergent point being the same as the coordinates of the preset initial incident point as the candidate path.

4. A method of determining the distribution of light spots within a multireflection gas cell as claimed in any of claims 1 to 3 wherein the optical model is a spherical equation based on the sphere on which the first and second spherical mirrors lie and the step of determining the path of the rays comprises:

calculating the next intersection point coordinate of the next incident ray and the first spherical mirror based on the incident point coordinate and the incident angle of the next incident ray and the spherical equation, and determining the reflection angle of the next reflected ray reflected by the first spherical mirror;

and after the light rays are determined to be emitted through the spherical mirror, determining the light spot distribution pattern formed by the light rays on the first spherical mirror and the second spherical mirror based on the determined coordinates of the plurality of intersection points.

5. The method of determining the spot distribution within a multireflection gas cell of any of claims 1-4, wherein:

the range of the relative distance d is that d is less than or equal to 2R, wherein R is the curvature radius of the first spherical mirror and the second spherical mirror.

6. The method of determining the spot distribution within a multireflection cell of any of claims 1-5, wherein:

the predetermined distance interval is 1 mm.

7. The method of determining the spot distribution within a multireflection gas cell of any of claims 1-6, wherein:

the predetermined number of reflections is in the range of 6-1000.

8. The method of determining the spot distribution within a multireflection cell of any of claims 1-7, wherein:

the predetermined spot pitch range is not less than 1 mm.

9. The method of determining the spot distribution within a multireflection cell of any of claims 1-8, wherein:

the first spherical mirror and the second spherical mirror are coaxially and symmetrically arranged, and the curvature radius and the mirror surface diameter of the first spherical mirror and the second spherical mirror are the same.

10. The method of determining the spot distribution within a multireflection gas cell of any of claims 1-9, further comprising the steps of:

determining a stable interval of the shooting point coordinates;

determining an exit point coordinate corresponding to each candidate path in the candidate path set and a corresponding relative distance;

setting a first stability index corresponding to the relative distance;

determining a real-time relative distance based on the relative distance and a first stability index, determining a first real-time path of the light in the multiple gas reflecting chambers based on the real-time relative distance, and determining a first real-time emergent point coordinate of the light according to the first real-time path;

judging whether the first real-time exit point coordinate is in the stable interval, if so, taking the corresponding candidate path as a first stable path, and generating a first stable path set for all first stable paths in the candidate path set;

and acquiring a light spot distribution pattern corresponding to each first stable path in the first stable path set to generate a first stable light spot pattern set.

11. The method of determining the spot distribution within a multireflection gas cell of any of claims 1-10, further comprising the steps of:

determining a stable interval of the shooting point coordinates;

determining an exit point coordinate corresponding to each candidate path in the candidate path set and a corresponding initial incident angle;

setting a second stable index corresponding to the initial incident angle;

determining a real-time initial incident angle based on the initial incident angle and a second stable index, determining a second real-time path of the light in the multiple gas reflecting chambers based on the real-time initial incident angle, and determining a second real-time emergent point coordinate of the light according to the second real-time path;

judging whether the second real-time exit point coordinate is in the stable interval, if so, taking the corresponding candidate path as a second stable path, and generating a second stable path set for all second stable paths in the candidate path set;

and acquiring a light spot distribution pattern corresponding to each second stable path in the second stable path set to generate a second stable light spot pattern set.

12. The method of determining the spot distribution within the multireflection cell of claim 11, further comprising the steps of:

acquiring all stable paths included by the first stable path set and the second stable path set to generate a target stable path set;

and acquiring a light spot distribution pattern corresponding to each stable path in the target stable path set to generate a target stable light spot pattern set.

13. A computing device, comprising:

at least one processor; and

a memory storing program instructions configured for execution by the at least one processor, the program instructions comprising instructions for performing the method of any of claims 1-12.

14. A readable storage medium storing program instructions that, when read and executed by a computing device, cause the computing device to perform the method of any of claims 1-12.